Help me in solving LPYAS164 problem

help
,
1

My issue

what is my test case was wrong

My code

#include <stdio.h>

int main() {
    int N;
    scanf("%d", &N);

    for (int i = 1; i <= N; i++) {
        for (int j = 1; j <= N - i + 1; j++) {
            printf("*");
        }
        for (int j = 1; j <= 2 * (i - 1); j++) {
            printf(" ");
        }
        for (int j = 1; j <= N - i + 1; j++) {
            printf("*");
        }
        printf("\n");
    }

    for (int i = N; i >= 1; i--) {
        for (int j = 1; j <= N - i + 1; j++) {
            printf("*");
        }
        for (int j = 1; j <= 2 * (i - 1); j++) {
            printf(" ");
        }
        for (int j = 1; j <= N - i + 1; j++) {
            printf("*");
        }
        printf("\n");
    }

    return 0;
}

Learning course: Roadmap to 3*
Problem Link: https://www.codechef.com/learn/course/klu-roadmap-3star/KLURMP300B/problems/LPYAS164